microbiology chapter 11 test bank

microbiology chapter 11 test bank Related

Review microbiology chapter 11 test bank related questions and content

Which bacterium is known as a common cause of hospital-acquired infections?

  • A. Clostridium botulinum
  • B. Staphylococcus aureus
  • C. Treponema pallidum
  • D. Mycobacterium leprae
Correct Answer: B

Rationale: The correct answer is B: Staphylococcus aureus. This bacterium is known as a common cause of hospital-acquired infections due to its ability to colonize the skin and mucous membranes of healthcare workers and patients. Staphylococcus aureus can cause various infections, including surgical site infections and bloodstream infections, in healthcare settings.

Rationale:
1. Clostridium botulinum is known for causing foodborne botulism, not hospital-acquired infections.
2. Treponema pallidum causes syphilis, which is primarily transmitted through sexual contact, not hospital settings.
3. Mycobacterium leprae causes leprosy, which is not commonly associated with hospital-acquired infections.

In summary, Staphylococcus aureus is the correct answer as it is a common cause of hospital-acquired infections due to its prevalence in healthcare environments, unlike the other choices which are not typically associated with hospital-acquired infections.

You may also like to solve these questions

Which is the main mechanism of passing the infection with Listeria monocytogenes from man to man:

  • A. alimentary mechanism
  • B. transmission
  • C. transplacental mechanism
  • D. physical contact
Correct Answer: C

Rationale: The correct answer is C, transplacental mechanism. Listeria monocytogenes can cross the placenta, infecting the fetus during pregnancy. This mechanism allows the bacteria to be transmitted from mother to baby in utero. Alimentary mechanism (A) involves ingestion of contaminated food, not direct transfer between individuals. Transmission (B) is a broad term that doesn't specify the specific route of Listeria transmission. Physical contact (D) is not a common mode of Listeria transmission compared to transplacental transmission in the case of maternal-fetal infection.

Fossils of prokaryotes go back __________ billion years.

  • A. 4.0 to 5.0
  • B. 3.5 to 4.0
  • C. 2.5 to 3.0
  • D. 2.2 to 2.7
Correct Answer: B

Rationale: The correct answer is B: 3.5 to 4.0 billion years. Prokaryotic fossils date back to around 3.5 to 4.0 billion years ago, based on scientific evidence. This timeframe aligns with the earliest known evidence of life on Earth. Choices A, C, and D have incorrect timelines that do not correspond to the established age range of prokaryotic fossils. Choice A is too broad and includes a range that extends beyond the known fossil record. Choices C and D have much younger timelines, which do not match the historical evidence of prokaryotic life dating back billions of years.

Which antibiotics against Parvovirus B19 can be found during the first 10-14 days of the infection:

  • A. IgG
  • B. IgA
  • C. IgD
  • D. IgM
Correct Answer: D

Rationale: The correct answer is D: IgM. IgM antibodies are the first type of antibodies produced by the immune system in response to an acute infection, such as Parvovirus B19. During the first 10-14 days of the infection, IgM antibodies are usually detectable in the blood, indicating a recent or ongoing infection. IgG antibodies (choice A) are produced later in the immune response and indicate past infection or immunity. IgA (choice B) is more commonly associated with mucosal immunity and may not be as prominent in the early stages of systemic infections. IgD (choice C) is primarily found on the surface of B cells and is involved in B cell activation but is not typically used as a marker for acute infections like IgM.

A woman hospitalized in the surgical department complains of pain in her lower abdomen and in the small of her back, frequent and painful urination. Urine culture test revealed gram-negative oxidase- positive bacilli that formed green mucoid colonies with specific smell. What causative agent can be suspected?

  • A. Pseudomonas aeruginosa
  • B. Mycoplasma pneumonia
  • C. Str.pyogenes
  • D. Proteus mirabilis Helicobacter
Correct Answer: D

Rationale: The correct answer is D: Proteus mirabilis. The patient's symptoms of lower abdominal pain, back pain, frequent/painful urination, and the presence of gram-negative oxidase-positive bacilli forming green mucoid colonies with a specific smell suggest a urinary tract infection caused by Proteus mirabilis. This bacterium is known for causing UTIs and is characterized by its swarming motility and distinctive odor.

A: Pseudomonas aeruginosa is commonly associated with hospital-acquired infections but does not typically cause UTIs with the specific characteristics described.
B: Mycoplasma pneumonia is a bacterium that causes respiratory infections, not UTIs.
C: Str.pyogenes (Streptococcus pyogenes) is a common cause of strep throat and skin infections, not UTIs.
D: Helicobacter pylori is associated with gastritis and peptic ulcers, not UTIs.

Which of the following bacteria is associated with the disease known as whooping cough?

  • A. Bordetella pertussis
  • B. Clostridium tetani
  • C. Haemophilus influenzae
  • D. Staphylococcus aureus
Correct Answer: A

Rationale: 1. Bordetella pertussis causes whooping cough.
2. It secretes toxins that damage the respiratory tract.
3. Symptoms include severe coughing fits and the characteristic "whoop" sound.
4. Clostridium tetani causes tetanus, not whooping cough.
5. Haemophilus influenzae causes various infections, not whooping cough.
6. Staphylococcus aureus causes skin infections, not whooping cough.

Copyright © 2025 Nokea. All rights reserved.